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. 1988 Feb;62(2):454–462. doi: 10.1128/jvi.62.2.454-462.1988

Mapping of functional and antigenic domains of the alpha 4 protein of herpes simplex virus 1.

J Hubenthal-Voss 1, R A Houghten 1, L Pereira 1, B Roizman 1
PMCID: PMC250555  PMID: 2447289

Abstract

Monoclonal antibodies to alpha 4, the major regulatory protein of herpes simplex virus 1, have been shown to differ in their effects on the binding of the protein to its DNA-binding site in the promoter-regulatory domain of an alpha gene. To map the epitopes, we expressed truncated genes in transient expression systems. All 10 monoclonal antibodies tested reacted with the N-terminal 288-amino-acid polypeptide. To map the epitopes more precisely, 29 15-mer oligopeptides, overlapping by five amino acids at each end, were synthesized and reacted with the monoclonal antibodies. The nine reactive monoclonal antibodies were mapped to seven sites. Of the two monoclonal antibodies which blocked the binding of alpha 4 to DNA, one (H950) reacted with oligopeptide no. 3 near the N terminal of the protein, whereas the second (H942) reacted with oligopeptide no. 23 near the C terminus of the 288-amino-acid polypeptide. In further tests, oligopeptide no. 19 was found to compete with two host proteins, designated as alpha H1 and alpha H2-alpha H3, for binding to DNA as well as to retard DNA in a band shift assay, whereas oligopeptides no. 26, 27, and 28 enhanced the binding of alpha 4 to DNA. Moreover, oligopeptide no. 27 was also found to retard DNA in a band shift assay. Polypeptide no. 19 competed with alpha 4 for binding to DNA, whereas no. 27 neither enhanced nor competed with the binding of the host polypeptide alpha H1 to its binding site in the promoter-regulatory domain of an alpha gene, but did enhance the binding of the alpha H2-alpha H3 protein to its binding site. In contrast to these results, the truncated alpha 4 polypeptide, 825 amino acids long, bound to the viral DNA, whereas a shorter, 519-amino-acid-long, truncated polypeptide did not. The 825-amino-acid polypeptide was previously shown to induce in transient expression of a late (gamma 2) viral gene.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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